after you beat the elite four go to the safari zone and then you go to the place with the gps Pokemon and go to the spaces in the grass and then i forgot the grass place i got it so it is in the grass place somewhere and you find the TM hydro pump and you could also find it by finishing the hoenn pokedex and then go to professor birch and when he talks to you about the national pokedex that he will give you talk to him again and then he will say "oh did i forget to give you this" and he will give you the TM hydro pump i hope this helps you.
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Salamence can only learn Hydro Pump as an egg move in Pokemon Emerald.
You cannot find hydro pump. The reason is because it is not a TM. Most water Pokemon can learn it when they have reach a certain level.
It learns Hydro Pump and Rain Dance through level up. Through TM and HM, it can learn Water Pulse, Surf, Waterfall, and Dive.
There isn't a TM called hydro pump you can only get a Pokemon to use if it can learn it leveling up
Hydro Pump is not an hm but you can get a water type starter to know it by visiting a house on the east side of the unova region.